Manufacture of white titanium-oxid products



ject of the Kin UNITED STATES PATENT OFFICE- IPEDER FABUP, OF TBONDHJ'EM, NORWAY, ASSIGNOB, BY MESNE ASSIGNMENTS, TO

TITAN CO. .A/S., 0F CHRISTLANIA, NORWAY.

unturao'ronnf or wnrrn TITANIUM-OXID raonocrs.

No Drawing.

To all whom it may concern:

Be it known that I, Pnonn FAnUr, a subof Norway, residing at Trondhjem, in t e Kingdom of Norway, have invented certain new and useful 1m provements in the Manufacture of White Titanium-Oxid Products; and I do hereby declare the followin to be a full, clear, and

exact description 0 the invention, such as' will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a process of rendering titanium oxygen compounds suitable for use as pigments in white or light colored paints and to the product obtained thereby, the purpose of the invention being particularly to renderthe said compounds stable against chemical and physical action, and especially to prevent discoloration of the paint in which the pigment is used when exposed to the action of heat as the relatively insoluble compounds of aluminum, calcium, lead, zinc and similar metals, as for example, the oxide, hydroxids, carbonates, sulfates, sulfids, etc., possess the desirable characteristics above set forth.

The process is preferably carried intoeffeet by treating particles of the titanium compounds suspended in water with a solution of a salt or salts of the metal or metals chosen, thoroughly stirring the mixture and subsequently introducing a suitable precipitant whereby the metal or metals chosen are deposited upon the particles of the titanium compound in a relatively insoluble form. Suitable precipitants for this purpose comprise for example, sodium carbonate, sodium hydroxid, ammonium hyroxid, a sulfate or sulfid, etc., of a metal or mixtures of such precipitants. The amount of protecting material employed de ends to a certain extent on the character 0 the prodnot sought, 2'. c., whether it is desired that the special properties of the protecting ma specification of Letters Patent. P t f F 15, 1921 Application filed November 9, 1916. Serial No. 130,416. 7 i

terial be prominent or negligible. It has been found that only a comparatively low percentage of the protecting material is nec essary to stabilize the pigment, and unless 1t s desired to modify the inherent characteristics of the pigment, I prefer that only this small quantity-be employed.

In order that the invention may be thoroughly comprehended the followmgexaniple of theprocess is given, it bein under stood that this is done for illustrative purposes and that the invention is not intended to be limited thereby or to the materials selected.

The titanium compounds selected, for example, elther an oxld or a hydroxid, is if necessary reduced to a stateof suflicient fineness for suspension in water. The powder is placed into a vat of water and kept in suspension. A solution 'of aluminum sulfate in the desired quantity is added to the contents of the vat. I' have found that good results are obtainedv by using the aluminum sulfate in quantities sufficient to cause the final product to contain aluminum oxld corresponding to about two and onehalf per cent. by weight of the titanium compound present. After thorough mixing, a solution of sodium carbonate is added 1n quantity suflicient to precipitate the aluminum in the form of a hydroxid. 'Agitation is continued until the precipitation is complete. The solid particles are allowed to settle and the supernatant liquid is drawn oil. The precipitate, which comprises the titanium compound now covered with aluminum hydroxid, is thoroughly washed and dried, and further treated to obtain the desired product. The product when reduced to powder is ready for use as. a pigment, or for other uses to which it is adapted. It is white or light colored and is practically stable against the action of heat and light incident to the ordinary use of paint. 1

The foregoing detailed description has been given for clearness of understandin and no undue limitation should be deduce therefrom, but the appended claims should 'be construed as broadly as permissible in oxygen compound for use as a pigment, which comprises precipitatin upon cles thereof a white and relatlvely insoluble compound of a metal.

2. The process of stabilizing a titanium oxygen compound for use as a pigment, which comprises precipitatin upon particles thereof a relatively insolu le. compound of aluminum, substantially as described.

3. The process of stabilizing a titanium oxygen compound for use. as a pigment, which comprises precipitating aluminum hydroxid upon particles thereof, substantially as described,

4. The process of stabilizing a titanium oxygen compound for use as a pigment, which comprises precipitating aluminum hydroxid upon particlesthereof, the quantity of resultant aluminum oxid being two and one-half percent. by weight of the quantity of titanium oxygen compound inthe resultant scribed.

5. The process of stabilizing a titanium oxygem compound for use asa pigment, which comprises precipitating upon'particles thereof a white and relatlvel insoluble compound of a metal by means 0 a precipiproduct, substantially as detant, one of the resultant compounds of the partible compound of aluminum by means of a soluble carbonate, substai 'tiallyas described.

8. The process of stabilizing a titanium .oxygen compound for use as a pigment, which consists in precipitating alummum hydroxid upon suspended particles thereof by means of a soluble carbonate, substantially as described. v

9. The process of stabilizing a titanium oxygen compound for use as a white or light colored pigment,1which consists in precipitating aluminum hydroxid upon suspended particles thereof by means of sodium carbonate, substantially as described.

10. As a new and useful-article of manufacture, a pigment comprising a titanium oxygen compound and a stabilizing agent for the said compound, the stabilizing agent comprising a relatively insoluble precipitated, compound of aluminum, substantially as described.

11. As a new and useful article of manu- I facture, a pigment comprising a titanium oxygen compound and a stabllizing agentfor the said compound, thestabilizingagent comprising aluminum oxid,'substantially-- as described.

12. As a new and useful article of manu- 4 facture, a pigment colnrising a titanium oxygen compound and-a ummum oxid, the

quantity of aluminum oxid being two and one-half per cent. by weight of the quantity of titanium.- oxygen compound, substantially as described.

In testimony that I claim the foregoing as my invention, I have signed my name in presence oftwo subscrib' witnesses.

' PE- ER FARUP.

Witnesses FERNANDA OLSEN, NANNA ELLISEN. 

